fix(vecadd): link advapi32 for windows nanorand

.github/workflows/ci_windows.yml

@@ -106,10 +106,8 @@ jobs:
         run: cargo build --all-features -p cust_raw
 
       # Exclude crates that require cuDNN, not available on Windows CI: cudnn, cudnn-sys.
-      # Exclude vecadd because of a link error involving nanorand and `SystemFunction036` (a.k.a.
-      # `RtlGenRandom`).
       - name: Build workspace
-        run: cargo build --workspace --exclude cudnn --exclude cudnn-sys --exclude "vecadd*"
+        run: cargo build --workspace --exclude cudnn --exclude cudnn-sys
 
       # Exclude crates that require cuDNN, not available on Windows CI: cudnn, cudnn-sys.
       - name: Clippy

examples/vecadd/build.rs

@@ -4,6 +4,12 @@ use std::path;
 use cuda_builder::CudaBuilder;
 
 fn main() {
+    // On Windows, nanorand's entropy uses SystemFunction036 (RtlGenRandom) from advapi32.
+    // Explicitly link it so the MSVC linker resolves the symbol (avoids LNK2019 when
+    // mixing CRTs or with certain link orders).
+    #[cfg(target_os = "windows")]
+    println!("cargo:rustc-link-lib=advapi32");
+
     println!("cargo::rerun-if-changed=build.rs");
     println!("cargo::rerun-if-changed=kernels");